Re: [PATCH 1/9] Kbuild: only pass -fno-inline-functions-called-once for gcc

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On Fri, Aug 11, 2023, at 16:14, Nathan Chancellor wrote:
> On Fri, Aug 11, 2023 at 04:03:19PM +0200, Arnd Bergmann wrote:
>> From: Arnd Bergmann <arnd@xxxxxxxx>
>> 
>> clang ignores the -fno-inline-functions-called-once option, but warns
>> when building with -Wignored-optimization-argument enabled:
>> 
>> clang: error: optimization flag '-fno-inline-functions-called-once' is not supported [-Werror,-Wignored-optimization-argument]
>> 
>> Move it back to using cc-option for this one.
>> 
>> Fixes: 7d73c3e9c514 ("Makefile: remove stale cc-option checks")
>> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
>
> How can this even be hit with clang, as CONFIG_DEBUG_SECTION_MISMATCH
> was changed to depend on GCC in the same commit?

Good question, I have not noticed that part, but I'm pretty
sure I keep hitting this issue. I'll drop it from my
series to see if I can reproduce it.

Maybe what happens is that this triggers when changing from
gcc to clang in an output directory, the stake CONFIG_*
symbols are still evaluated while parsing the initial
Makefile but then cause problems.

     Arnd



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